Some papers have already reported on the rectenna of dipole antennas with ground plane. It was concluded that the infinite array of the dipole antennas with reflector could absorb all power of incident plane wave. This paper is concerned with the absorption efficiency of the rectenna composed of the CMSA. The efficiency is estimated explicitly using an infinite array model. THE RESONANT CHARACTERISTICS OF A CMSA The general geometry of the CMSA is show in Fig. 1. The microstrip antenna has many unique and attractive properties — low in profile, light in weight, compact and conformable in structure, easy to fabricate, and to be integrated with solid-state devices. All of these features are desirable for the receiving antenna of the rectenna. The resonant frequencies of the antenna correspond to eigenvalues. For the CMSA, its resonant angular frequency wr is given by the root of where Jn(x) is the Bessel Function of n order, a is the effective radius of the CMSA, and er is the relative dielectric constant of substrate. Solving this equation, the harmonic resonant frequencies are 1.66f0, 2.08f0, 2.9f0, 3.64f0, and so on, where f0 is the dominant frequency. Therefore, it can be expected that there exists almost no higher harmonic reradiation from the CMSA. The experimental results showed that the insertion losses at 2f0, 3f0 were 16.4 dB and 7.2 dB, respectively (2).
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